Improvement in wrought-iron girders



D. HAMMOND.

WRoUGHT-IRQN GIRDER. N.184,'522. Patented N0'v.z1,1s7s.

UNITED STATES PATENT OFFICE.

DAVID HAMMOND, OF CANTON, OHIO, ASSIGNORTO WROUGHT IRON l BRIDGE COMPANY, 0F SAME PLACE.

IMPROVEMENT IN WROUGHT-IRON GIRDERS.

Specication forming part of Letters Patent No. l 84,522, dated November 21, 1876; application filed August 19, 1876.

To all whom it may concer-n:

Be it known that I, DAVID HAMMOND, of Canton, in the county of Stark and State ot Ohio, have invented certain new and useful Improvements in Wrought-Iron Girders; and

that the following is a full, clear, and exact head, plate, web, and angle, and plate lower head.

The head A consists of a T- bar made with leg B, and having its head at on top, and provided with'ribs a aon its under edges. The leg B can be placed at one side ofthe center of the head, toA secure Aa symmetrical appearance, if desired. The head, being made flat on top, allows the addition ot' cover-plates when desired, for additional section at the center or along the whole length of the head. The

web C of plate or lattice-bar is riveted to the leg B of the upper head A, and the lower head of the'girder can be made of a second T- bar, A', or of two angles, D D, with a plate, E, if desired, for extra section, as shown. p

The advantages of this construction will be evident on considering that the upperhead of the girder acts under compression, and when the girder is loaded this head has a tendency to give way by bending sidewise. Consequently, by making such head wide and in one solid piece, and then concentrating the metal in the ribs on. the edges ofthe head, where it has the greatest effect to prevent crushing or cockling the head, the same amount of headsection will make a much stronger girder than -when used in the ordinary I-beam or anglebar form of head.-

What I-claim as new, and desire to secure by Letters Patent, is-

A wrought-iron girder having an upper T- head made with Aflat top fand ribs on its under edges, in combination with a plate or latticeweb and T or angle lower head, substantially as and for the purpose specilied. v

As evidence of the foregoing Witness my hand this 7th day of August, A. D. 1876.

DAVID HAMMOND. Witnesses:

WM. BRITTON, J 0B ABBOTT. 

